[Examples] Demo pre-built instance handlers + inspector coverage (#390)

* [Tests] Bump MCP Inspector to 0.22.0 for 2025-11-25 protocol

The pinned inspector 0.17.2 predates the protocol version bump to
2025-11-25 (v0.6.0) and rejects the handshake with "Server's protocol
version is not supported", failing every inspector snapshot test. 0.22.0
negotiates the current protocol; the full inspector suite passes against
it (95 tests, 7 pre-existing skips).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* [Examples] Demo pre-built instance handler in combined-registration

Extends the combined-registration example with a third handler style:
a pre-built object instance `[$instance, 'method']`, alongside the
existing discovered and manual class-string handlers. PreconfiguredGreeter
takes a scalar constructor argument neither the container-less
`new $className()` fallback nor the auto-wiring container can build, so it
can only be registered as an already-constructed instance — exercising the
resolver path added in the parent branch.

Adds an inspector snapshot case (tools/call instance_greeter) and updates
the tools/list snapshot.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/Inspector/Http/HttpCombinedRegistrationTest.php

@@ -25,6 +25,14 @@ final class HttpCombinedRegistrationTest extends HttpInspectorSnapshotTestCase
                 ],
                 'testName' => 'manual_greeter',
             ],
+            'Instance Greeter Tool (pre-built object handler)' => [
+                'method' => 'tools/call',
+                'options' => [
+                    'toolName' => 'instance_greeter',
+                    'toolArgs' => ['name' => 'HTTP Test User'],
+                ],
+                'testName' => 'instance_greeter',
+            ],
             'Discovered Status Check Tool' => [
                 'method' => 'tools/call',
                 'options' => [

tests/Inspector/Http/snapshots/HttpCombinedRegistrationTest-tools_call-instance_greeter.json

@@ -0,0 +1,9 @@
+{
+  "content": [
+    {
+      "type": "text",
+      "text": "Willkommen, HTTP Test User!"
+    }
+  ],
+  "isError": false
+}

tests/Inspector/Http/snapshots/HttpCombinedRegistrationTest-tools_list.json

@@ -16,6 +16,22 @@
         ]
       }
     },
+    {
+      "name": "instance_greeter",
+      "description": "A tool registered as a pre-built object instance.",
+      "inputSchema": {
+        "type": "object",
+        "properties": {
+          "name": {
+            "type": "string",
+            "description": "the name to greet"
+          }
+        },
+        "required": [
+          "name"
+        ]
+      }
+    },
     {
       "name": "discovered_status_check",
       "description": "A tool discovered via attributes.",

tests/Inspector/InspectorSnapshotTestCase.php

@@ -18,7 +18,7 @@ use Symfony\Component\Process\Process;
 
 abstract class InspectorSnapshotTestCase extends TestCase
 {
-    private const INSPECTOR_VERSION = '0.17.2';
+    private const INSPECTOR_VERSION = '0.22.0';
 
     /** @param array<string, mixed> $options */
     #[DataProvider('provideMethods')]